257817250139 has 2 divisors, whose sum is σ = 257817250140. Its totient is φ = 257817250138.

The previous prime is 257817250063. The next prime is 257817250147. The reversal of 257817250139 is 931052718752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257817250139 is a prime.

It is not a weakly prime, because it can be changed into another prime (257817250189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128908625069 + 128908625070.

It is an arithmetic number, because the mean of its divisors is an integer number (128908625070).

Almost surely, 2^257817250139 is an apocalyptic number.

257817250139 is a deficient number, since it is larger than the sum of its proper divisors (1).

257817250139 is an equidigital number, since it uses as much as digits as its factorization.

257817250139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1058400, while the sum is 50.

The spelling of 257817250139 in words is "two hundred fifty-seven billion, eight hundred seventeen million, two hundred fifty thousand, one hundred thirty-nine".